Catalyst support and catalysts prepared therefrom

ABSTRACT

A supported catalyst useful in processes for chemically refining hydrocarbon feedstocks is prepared, the catalyst comprising a metal from Group 6 of the Periodic Table, a metal from Groups 8, 9 or 10 and optionally phosphorous, wherein the metals, and phosphorous when present, are carried on a foraminous carrier or support, the carrier or support, preferably comprises porous alumina having a total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and comprising: (a) equal to or greater than about 78% to about 95% of TPV in pores having a diameter of less than about 200 Angstroms (Å); (b) greater than about 2% to less than about 19% of the TPV in pores having a diameter of about 200 (Å) to less than about 1000 Å; (c) equal to or greater than 3% to less than 12% of the TPV in pores having a diameter equal to or greater than about 1000 Å; and (d) a pore mode equal to or greater than about 90 Å and less than about 160 Å. Preferably the support exhibits a d50 greater than about 100 Å and less than about 150 Å.

This application is a continuation of U.S. application Ser. No.14/635,407 filed Mar. 2, 2015, which is a continuation of applicationSer. No. 13/822,340, filed on May 3, 2013, which is a national phaseentry under 35 U.S.C. §371 of International Application No.PCT/US2012/049415 filed Aug. 3, 2012, published in English, which claimspriority from U.S. Provisional Patent Application No. 61/530,108 filedSep. 1, 2011, all of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

There is a continuing need in the petroleum industry for improvedcatalyst supports and supported catalysts derived therefrom, which haveenhanced activity and improved catalyst life and exhibiting a desirablebalance of morphological properties.

Foraminous carriers in particulate form have been found to be useful forexample as catalyst supports and in preparing catalysts for chemicalprocesses. Such applications include added catalytic materials, such asmetallic ions, finely-divided metals, cations, and the like, to thecarrier. The level and distribution of these metals on the support, aswell as the properties of the support itself are representativeparameters that influence the complex nature of catalytic activity andlife.

For supported catalysts used in chemical reactions, the morphologicalproperties of the support, such as surface area, pore volume, pore sizeand pore size distribution of the pores that comprise the total porevolume are very important. Such properties influence the nature andconcentration of active catalytic sites, the diffusion of the reactantsto the active catalyst site, the diffusion of products from the activesites and catalyst life. In addition, the support and its dimensionsalso influence the mechanical strength, density and reactor packingcharacteristics, all of which are important in commercial applications.

Hydroprocessing catalysts in petroleum refining represent a largesegment of alumina-supported catalysts in commercial use and suchhydroprocessing applications span a wide range of feed types andoperating conditions, but have one or more common objectives, namely,removal of heteroatom impurities (such as components selected from thegroup consisting of sulfur-containing compounds, nitrogen-containingcompounds, metal-containing compounds (sometimes referred to as sulfur,nitrogen and metals), asphaltenes, carbon residue, sediment precursors,and mixtures thereof), increasing the hydrogen to carbon (H/C) ratio inthe products (thereby reducing aromatics, density and/or carbonresidues), and cracking carbon bonds to reduce boiling range and averagemolecular weight.

As refiners increase the proportion of heavier, poorer quality crude oilin the feedstock to be processed, the need grows for processes to treatthe fractions containing increasingly higher levels of metals,asphaltenes, and sulfur. It is widely known that various organometalliccompounds and asphaltenes are present in petroleum crude oils and otherheavy petroleum hydrocarbon streams, such as petroleum hydrocarbonresidua, hydrocarbon streams derived from tar sands, and hydrocarbonstreams derived from coals. The most common metals found in suchhydrocarbon streams are nickel, vanadium, and iron. Such metals are veryharmful to various petroleum refining operations, such as hydrocracking,hydrodesulfurization, and catalytic cracking. The metals and asphaltenescause interstitial plugging of the catalyst bed and reduced catalystlife and metals present in such streams which deposit on hydroprocessingcatalysts tend to poison or deactivate the catalyst. Moreover,asphaltenes tend to reduce the susceptibility of the hydrocarbons todesulfurization. If a catalyst, such as a desulfurization catalyst or afluidized cracking catalyst, is exposed to a hydrocarbon fraction thatcontains metals and asphaltenes, the catalyst can become deactivatedrapidly and thus be subject to premature replacement.

Various hydroconversion processes are effectively carried out using anebullated bed (EB) system. In an EB, preheated hydrogen and residfeedstock enter the bottom of a reactor wherein the upward flow of residwith or without an liquid internal recycle suspend the catalystparticles in the liquid phase. In improved EB processes, part of thecatalyst is continuously or intermittently removed in a series ofcyclones and fresh catalyst is added to maintain activity. Approximatelyabout 1 wt. % of the catalyst inventory is replaced each day in anebullated bed system. Thus, the overall system activity is the weightedaverage activity of catalyst varying from fresh catalyst particles toold or substantially deactivated particles. More particularly, the useof a series of ebullated bed reactors containing a catalyst havingimproved effectiveness and activity maintenance in the desulfurizationand demetallation of metal-containing heavy hydrocarbon streams areknown.

In general, it has been desirable to design a hydroprocessing catalystso that it exhibits the highest surface area in order to provide themaximum concentration of catalytic sites and activity. However, surfacearea and pore diameter are inversely related within practical limits.Consequently, a catalyst support, such as alumina particles, containingpredominantly small pores will exhibit the highest surface area. Incontrast, sufficiently large pores are required for diffusion offeedstock components, particularly as the catalyst ages and fouls, butlarger pores have a lower surface area. More specifically, the catalystformulator or designer as well as the process engineer is faced withcompeting considerations which often dictate a balance of morphologicalproperties for supports as well as catalysts derived therefrom.

For example, it is recognized (see for example, U.S. Pat. No. 4,497,909)that while pores having a diameter below 60 Angstroms (Å), within therange of what is referred to therein as the micropore region, have theeffect of increasing the number of active sites of certainsilica/alumina hydrogenation catalysts, these very same sites are thefirst ones clogged by coke thereby causing a reduction in catalystactivity. Similarly, it is also accepted that when such catalysts havemore than 10% of the total pore volume occupied by pores having a porediameter greater than 600 Å, within the region referred to hereingenerally as the macropore region, the mechanical crush strength islowered as is the catalyst activity. Finally, it is recognized, that forcertain silica/alumina catalysts, that maximization of pores having apore diameter between 150 Å and 600 Å, approximately within the regionreferred to therein as the mesopore region, is desirable for acceptableactivity and catalyst life.

Thus, while increasing the surface area of the catalyst can increase thenumber of the active sites, such surface area increase naturally resultsin an increase of the proportion of pores in the micropore region andmicropores are more easily clogged by coke. In short, increases insurface area and maximization of mesopore diameter are antagonisticproperties. Moreover, not only must the surface area be high, but itshould also remain stable when exposed to petroleum feedstock conversionconditions such as high temperature and moisture. There has thereforebeen a continuing search for stable carrier particles that exhibit acombination of pore size distribution and total surface area that canprovide a combination of performance characteristics suitable for use ascatalyst supports, particularly when used to support catalyticallyactive metals for producing hydroprocessing catalysts.

It is further recognized that the physical and chemical properties ofthe carrier can depend on the procedures followed in its preparation andthat many preparation processes have been developed in attempts tooptimize its properties for use as a catalyst support material. Examplesof suitable foraminous carrier materials are described hereinbelow. Acarrier material such as alumina is frequently precipitated by combininga water-soluble, acidic aluminum compound which may be an aluminum saltsuch as aluminum sulfate, aluminum nitrate, or aluminum chloride, and analkali metal aluminate such as sodium or potassium aluminate. (See forexample, U.S. Pat. No. 4,154,812, Sanchez, M. G. and Laine, N. R.,assigned to W. R. Grace & Co., which is incorporated herein to theextent permitted.) Thus, while catalyst carriers, including aluminacarriers, are known, further improvements are needed in order to providecarriers having still further improved properties.

When used in ebullated bed resid hydrocracking processes, embodiments ofthe present invention increase 1000+° F. vacuum residuum (VR) or “resid”conversion and hydrodesulfurization (HDS) and hydrodemicrocarbon residue(HDMCR) or microcarbon reduction activity while maintaining catalystsediment control functionality. Converting VR into lighter productoccurs by thermocracking and catalytic hydrocracking at elevatedtemperature. Thus, suitable hydroprocessing catalysts are needed whichprovide suitable pore volume, surface area and pore size anddistribution characteristics for maximizing catalytic hydrocrackingreactions especially involving large molecules present in residuum.However, as discussed above, due to the nature of resid feedstock,catalysts gradually lose pore volume due to deposition of metals such asNi and V present in the feedstock as well as deposition of coke that mayform at elevated temperature, thus causing deterioration inhydrocracking activity of the catalyst with the progression of thereaction, and also increasing the formation of sediment.

Embodiments of the present invention include methods for preparingcatalyst carriers as well as hydroprocessing, HDS, hydrodenitrification(HDN), hydrodemetallation (HDM) and HDMCR and other catalysts preparedusing the carrier, and to processes for hydrodesulfurizing,hydrodenitrogenizing or hydrodemicrocarbonizing a hydrocarbon feedstockusing the aforementioned catalyst. More particularly, embodiments alsorelate to a method for the preparing a porous catalyst carrier andcatalyst using such carrier having preferred and defined porecharacteristics, including pore size and pore size distribution, andcontaining at least one metal and/or metal compound of Groups 6 (alsoreferred to as Group VIB) and Groups 8, 9 and 10 (also referred to asGroup VIII) of the Periodic Table of the Elements.

In the course of conducting hydroprocessing reactions, unconverted orpartially converted large feedstock molecules can aggregate andprecipitate from whole liquid product and form sediment which is ahighly undesirable hydroprocessing process by-product that can fouldownstream equipment, such as heat exchangers, separators andfractionators. It would be desirable to develop catalysts exhibitingimproved catalytic activity and/or stability, particularly in EBprocesses that do not negatively impact sediment formation, thusallowing refiners employing EB hydroconversion units to produce more andlighter petroleum products and with improved economics.

BRIEF SUMMARY OF THE INVENTION

One embodiment of the present invention comprises a supported catalystcomprising at least one metal from Group 6, alternatively referred to asGroup VIB, of the Periodic Table of the Elements, at least one metalfrom Groups 8, 9 or 10, alternatively referred to as Group VIII, of thePeriodic Table of the Elements, and optionally comprising phosphorous,wherein said metals, and phosphorous when present, are carried on aforaminous carrier or support, said carrier or support comprising havinga total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g andcomprising: (a) equal to or greater than about 78% to about 95% of TPVin pores having a diameter of less than 200 Angstroms (Å); (b) greaterthan about 2% to less than about 19% of TPV in pores having a diameterof 200 Å to less than 1000 Å; and (c) equal to or greater than 3% toless than 12% of said TPV in pores having a diameter equal to or greaterthan 1000 Å.

Further embodiments comprise processes for treating hydrocarbonfeedstocks to produce treated products, said processes selected from thegroup consisting of: (A) hydrodemetallation, hydrodenitrification,hydrodesulfurization, hydrocracking, said process comprising contactingsaid feedstock in at least one reactor with hydrogen under hydrocrackingconditions with a catalyst and recovering said product; (B)hydrotreating said hydrocarbon feed containing components boiling above1000° F., and components selected from the group consisting ofsulfur-containing compounds, nitrogen-containing compounds,metal-containing compounds, asphaltenes, carbon residue, sedimentprecursors, and mixtures thereof, comprising contacting said feed withhydrogen and a catalyst at isothermal or substantially isothermalhydrotreating conditions and recovering said treated product; (C)hydroconverting said hydrocarbon feed having components exhibiting aboiling point greater than 1000° F. to form product having an increasedproportion of components exhibiting a boiling point less than about1000° F. comprising contacting said feed with hydrogen and a catalyst atisothermal or substantially isothermal hydrotreating conditions andrecovering said product; and (D) hydroconverting said feed, comprisingcontacting said feed comprising a hydrocarbon oil with hydrogen and acatalyst under conditions of elevated temperature above about 600° F.and pressure above about 500 p.s.i.g. and recovering said product; saidcatalyst comprising at least one metal from Group 6, alternativelyreferred to as Group VIB, of the Periodic Table of the Elements, atleast one metal from Groups 8, 9 or 10, alternatively referred to asGroup VIII, of the Periodic Table of the Elements, and optionallycomprising phosphorous, wherein said metals, and phosphorous whenpresent, are carried on a foraminous carrier or support: said supportcomprising porous alumina having a total pore volume (TPV) of about 0.6cc/g to about 1.1 cc/g and pore size distribution and contentscorresponding to values as measured by the mercury porosimetry method:(1) equal to or greater than about 78% to about 95% of total pore volume(TPV) in pores having a diameter of less than 200 Angstroms (Å); (2)greater than about 2% to less than about 19% of TPV in pores having adiameter of 200 (Å) to less than 1000 Å; (3) equal to or greater than 3%to less than 12% of said pore volume in pores having a diameter equal toor greater than 1000 Å.

In a further embodiment the support exhibits a d50 greater than about100 Å and less than about 150 Å.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates the pore size distribution of a catalyst supported onan alumina carrier produced according to Example 9.

DETAILED DESCRIPTION

Definitions

As used herein the following terms or phrases have the indicatedmeanings.

The terms “catalysts” and “catalyst systems” are used interchangeablyherein.

The term “about” when used as a modifier for, or in conjunction with, avariable, characteristic or condition is intended to convey that thenumbers, ranges, characteristics and conditions disclosed herein areflexible and that practice of the present invention by those skilled inthe art using temperatures, rates, times, concentrations, amounts,contents, properties such as size, including pore size, pore volume,surface area, etc., that are outside of the stated range or differentfrom a single stated value, will achieve the desired result or resultsas described in the application, namely, preparation of porousforaminous catalyst carrier particles having defined characteristics andtheir use in preparing active catalysts and processes using suchcatalysts.

“Component” as applied to, for example, metals of the catalystimpregnating solution or catalyst per se refers to any compound orcomplex, including a salt, oxide, sulfide, or any intermediate formbetween oxide and sulfide of the metal in question.

“Comprise” or “comprising”: Throughout the entire specification,including the claims, the word “comprise” and variations of the word,such as “comprising” and “comprises,” as well as “have,” “having,”“includes,” “include” and “including,” and variations thereof, meansthat the named steps, elements, components or materials to which itrefers are essential, but other steps, elements, components or materialsmay be added and still form a construct within the scope of the claim ordisclosure. When recited in describing the invention and in a claim, itmeans that the invention and what is claimed is considered to be whatfollows and potentially more. These terms, particularly when applied toclaims, are inclusive or open-ended and do not exclude additional,unrecited elements, components or methods steps.

“Feedstocks” or petroleum feedstocks typically treated using processesthat include catalysts of the present invention are often described interms of being “heavy” or “light”. The terms “light” and “heavy” withregard to petroleum fractions are used herein in their normal sensewithin the refining industry to refer respectively to relatively low andhigh boiling point ranges. Heavy Fuel Oils (HFOs) include both finishedproducts (residual fuels) and the primary refinery streams from whichthey are blended. Members of the heavy fuel oil category are a diversegroup of substances encompassing hydrocarbons with a wide range ofmolecular weights, carbon numbers (typically about C₇ to about C₅₀) andboiling points (about 250° F. to about 1112° F. (about 121° C. to 600°C.). In addition to petroleum hydrocarbons they contain one or moreheterocyclic compounds containing sulfur, nitrogen, and oxygen, andorgano-metallic or metallic compounds. Finished heavy fuels (residualfuels) are products that comprise primarily the residuum of the refiningprocess after virtually all of the higher-quality hydrocarbons have beendistilled, cracked, or catalytically removed from crude oil feedstock.Substantially all (at least 90 vol. %) of hydrocarbon feed streams orfeedstocks typically fall within the boiling point range between about300° F. and 1050° F. and preferably between about 600° F. and 1000° F. Afeedstock can comprise a mixture of petroleum fractions such asatmospheric and vacuum gas oils (AGO and VGO). Suitable feedstocksinclude heavy hydrocarbonaceous mineral or synthetic oil or a mixture ofone or more fractions thereof. Thus, such known feedstocks as straightrun gas oils, vacuum gas oils, demetallized oils, deasphalted vacuumresidue, coker distillates, cat cracker distillates, shale oil, tar sandoil, coal liquids and the like are contemplated. A preferred feedstockwill have a boiling point range starting at a temperature above about260° C. (above about 500° F.). Hydrocracking feedstock may containnitrogen, usually present as organonitrogen compounds in amounts between1 ppm and 1.0 wt. %. The feedstock will normally also comprisesulfur-containing compounds sufficient to provide a sulfur contentgreater than 0.15 wt. %. The boiling point ranges of various productfractions recovered in any particular refinery will vary depending onsuch factors as the characteristics of the crude oil source, therefinery's local markets, product prices, etc. The American PetroleumInstitute (API) has recommended to the EPA a list of generic names forrefinery streams consistent with industry operations and covering allknown processes used by refiners. The list, including generic names, CASnumbers and definition of each stream, was published by the EPA as“Addendum I, Generic Terms Covering Petroleum Refinery Process Streams.”The definitions for these streams can also be found “High ProductionVolume (HPV) Chemical Challenge Program, Test Plan, Heavy Fuel OilsCategory”, Submitted to the US EPA, The Petroleum HPV Testing Group(Jun. 17, 2004), Appendix A, pages 38-42. Petroleum streams suitable forprocessing using the catalysts of the present invention are identifiedin the EPA document, the content of which is incorporated herein byreference, to the extent permitted.

“Group” or “Groups”: Any reference to a Group or Groups of the PeriodicTable of the Elements is preferably to the Group or Groups as reflectedin the Periodic Table of Elements using the IUPAC system for numberinggroups of elements as Groups 1-18. However, to the extent that a Groupis identified by a Roman numeral according, for example, to the PeriodicTable of the Elements as published in “Hawley's Condensed ChemicalDictionary” (2001) (the “CAS” system) it will further identify one ormore Element of that Group so as to avoid confusion and provide across-reference to the numerical IUPAC identifier.

“Median pore diameter” (MPD) can be calculated, for example, based onvolume, surface area or based on pore size distribution data. Medianpore diameter calculated by volume means the pore diameter above whichhalf of the total pore volume exists; median pore diameter calculated bysurface area means that pore diameter above which half of the total poresurface area exists. And median pore diameter calculated based on poresize distribution means the pore diameter above which half of the poreshave a larger diameter according to the pore size distributiondetermined as described elsewhere herein, for example, using mercuryintrusion.

“Micropore” as used herein means pores present in catalysts or catalystsupports produced according to processes of the invention having adiameter of less than 200 Å.

“Mesopore” as used herein means pores present in catalysts or catalystsupports produced according to processes of the present invention havinga diameter of 200 A to less than 1000 Å.

“Macropore” as used herein means pores present in catalysts or catalystsupports produced according to processes of the present invention havinga diameter equal to or greater than 1000 Å.

Each of the above definitions of micropore, mesopore and macropore areconsidered distinct such that there is no overlap and pores are notcounted twice when summing up percentages or values in a distribution ofpore sizes for any given sample.

“d50” means the median pore diameter as measured by mercury porosimetry.Thus it corresponds to the median pore diameter calculated based on poresize distribution and is the pore diameter above which half of the poreshave a larger diameter. d50 values reported herein are based on nitrogendesorption using the well-known calculation method described by E. P.Barrett, L. G. Joyner and P. P. Halenda (“BJH”), “The Determination ofPore Volume and Area Distributions in Porous Substances. I. Computationsfrom Nitrogen Isotherms,” J. Am. Chem. Soc., 1951, 73 (1), pp 373-380.

“Pore mode” as used herein means the pore diameter corresponding to thepeak maximum of the pore sized distribution (PSD) curve where thedifferential mercury intrusion volume, in cc/g, is plotted as a functionof the log differential of the pore diameter (dV/dlogD).

“Total pore volume” as used herein means the cumulative volume in cc/gof all pores discernable by either nitrogen desorption or mercurypenetration, also referred to as mercury intrusion (porosimetry)methods. For catalyst support or carrier particles and particularly foralumina powder, the pore diameter distribution and pore volume can becalculated with reference to nitrogen desorption isotherm (assumingcylindrical pores) by the B.E.T. (or BET) technique as described by S.Brunauer, P. Emmett, and E. Teller in the Journal of American ChemicalSociety, 60, pp 209-31.9 (1939); see also ASTM D 3037, which identifiesthe procedure for determining the surface area using the nitrogen BETmethod.

ASTM D4284-07, “A Standard Test Method for Determining Pore VolumeDistribution of Catalysts by Mercury Intrusion Porosimetry” is anaccepted test that is used to determine the volume distribution of poresin catalysts and catalyst carrier or support particles with respect tothe apparent diameter of the entrances to pores. As discussed above,generally both the size and volume of pores in a catalyst affect itsperformance Thus, the pore volume distribution is useful inunderstanding catalyst performance and may be one of the characteristicsspecified for a catalyst that can be expected to perform in a desiredmanner The values for pore volume, including total pore volume or totalintrusion volume, and various attributes of pore volume distribution,such as the percentage of pores in various size ranges, as well as poremode, are based on the mercury intrusion method.

The pore diameter distribution can be calculated by means of theformula:

${{pore}\mspace{14mu} {{diameter}\left( {{in}\mspace{14mu} {Angstroms}} \right)}} = \frac{150,000}{{absolute}\mspace{14mu} {mercury}\mspace{14mu} {{pressure}\left( {{in}\mspace{14mu} {bar}} \right)}}$

and in accordance with the mercury penetration method (as described byH. L. Ritter and L. C. Drake in Industrial and Engineering Chemistry,Analytical Edition 17, 787 (1945)), using mercury pressures of 1-2000bar. Mercury penetration is the technique of choice when the quantity ofpores <60Å in diameter is small as is the case, for example, inagglomerates.

The total N₂ pore volume of a sample is the sum of the nitrogen porevolumes as determined by the above described nitrogen desorption method.Similarly, the total mercury pore volume of a sample is the sum of themercury pore volumes as determined by the mercury penetration methoddescribed above using, for example, a contact angle of 130°, a surfacetension of 485 dynes/cm and a Hg density of 13.5335 gm/cc.

“Surface area” refers herein to the specific surface area determined bynitrogen adsorption using the BET technique as described above, whetherin powder or agglomerate form.

All morphological properties involving weight, such as pore volume, PV(cc/g) or surface area, (SA) (m²/g) can be normalized to a “metals freebasis in accordance with procedures well-known in the art. However, themorphological properties reported herein are on an “as-measured” basiswithout correcting for metals content.

“Periodic Table”: All references to the Periodic Table of the Elementsherein refers to the Periodic Table of the Elements, published by theInternational Union of Pure and Applied Chemistry (IUPAC), publishedon-line at http://old.iupac.org/reports/periodic_table/; version dated19 Feb. 2010.

“Substantially”: Unless otherwise defined with respect to a specificproperty, characteristic or variable, the term “substantially” asapplied to any criteria, such as a property, characteristic or variable,means to meet the stated criteria in such measure such that one skilledin the art would understand that the benefit to be achieved, or thecondition or property value desired is met. For example, see below foruse of the term “substantially” in connection with a description ofunimodal pore size distribution.

When used with reference to various processes for treating hydrocarbonfeedstocks, the phrase “substantially isothermal” is typicallyunderstood to mean operation of the process is such that temperature maytypically vary throughout the catalyst bed by less than about 50° F.,preferably less than about 40° F., more preferably less than about 30°F., for example less than about 20° F., such as close to 0° F. and up toabout 20° F. or 30° F. or 40° F. or as much as 50° F. In thealternative, operation of such a process may be referred to as operatingisothermally even while exhibiting a temperature variation as describedabove.

Carriers or supports useful in the present invention are generallyidentified as “foraminous” carriers; for purposes of the presentinvention such carriers will be generally understood to comprise manyholes, perforations and/or porosity. Examples of suitable foraminouscarrier materials include silica, silica gel, silica-alumina, alumina,titania, titania-alumina, zirconia, boria, terrana, kaolin, magnesiumsilicate, magnesium carbonate, magnesium oxide, aluminum oxide,precipitated aluminum oxide, activated alumina, bauxite, kieselguhr,pumice, natural clays, synthetic clays, cationic clays or anionic clayssuch as saponite, bentonite, kaolin, sepiolite or hydrotalcite, andmixtures thereof. Preferred foraminous carrier materials are silica,silica-alumina, alumina, titania, titania-alumina, zirconia, bentonite,boria, and mixtures thereof; silica, silica-alumina, and alumina areespecially preferred. Alumina for use as a carrier can be prepared, forexample, by converting an alumina precursor in pseudoboehmite form, intoa preferred form for use as a carrier material, gamma-alumina, typicallyusing calcination.

Alumina Powder Preparation

In carrying out embodiments of the present invention, aluminacompositions are typically prepared in a batch process in which thealumina is precipitated under controlled reactant concentrations andreaction conditions, including temperature, time, pH, reactant feedrates and the like. Such processes are generally known in the art (see,for example, U.S. Pat. No. 4,154,812, Sanchez et al., U.S. Pat. No.6,403,526, Lussier et al., and the patents cited therein, thedisclosures of which are incorporated herein by reference); relevantalumina preparative methods are disclosed herein.

In a preferred embodiment for preparing alumina, filter cake produced inthe course of the synthesis is dried to produce a powder of aluminawhich can be conveniently stored without degrading for long periods oftime prior to use in further processing. Drying of the filter cake maybe done by several methods, such as tray drying, belt drying, spraydrying, combinations of these and the like. Drying conditions aretypically adjusted to effect the partial removal of water, for exampleto a level of about 20 wt. % to about 35 wt. % volatiles, preferablyabout 22 wt. % to about 30 wt. %, for example, about 23, 24, 25, 26, 27,28, or 29 wt. % volatiles.

Dried alumina powder or washed alumina filter cake, or both, and waterare mixed or commingled to provide what is referred to as a damp or wetmix or a dough. Optionally, an acidic or basic aqueous medium, such asan aqueous solution of an acid or acid salt, can also be added to themixture. When an acid is included, preferably an aqueous solution of amonobasic mineral acid is commingled with water and the alumina toprovide the mix. Hydrochloric acid and other strong monobasic acids,including nitric acid may be used; nitric acid is preferred. Otheruseful acids include organic acids such as acetic acid, formic acid,propionic acid and the like. Alternatively, an aqueous base such asammonium hydroxide can be used. In addition, as disclosed in the art,recycled, calcined product fines in an amount of up to about 25 percentby weight of total alumina may advantageously be added during this step.

The mixture resulting from the previous step is referred to as a dampmix. This mix is formed into the carrier, such as in the form of pillsor other shapes, as described elsewhere herein. This step isconveniently conducted by extruding the damp mix, which is typicallyfollowed by drying and calcination of the pills.

Calcination may be done batchwise or continuously by contacting theshaped alumina carrier product with hot gases which may be eitherindirectly heated gases or the combustion products of ordinary fuelswith air. Regardless of the particular method used, the product istypically calcined at temperatures of about 1000° F. to about 2000° F.,alternatively at about 1200° F. to about 1900° F., such as about 1400°F. to about 1800° F., for periods of from about 30 minutes to about 3hours, preferably about 30 minutes to about 2 hours.

Another property that can be used to indicate whether or not a suitablepowder is obtained is referred to as the “dispersibility index” (DPI).The test method used to obtain DPI values reported herein is describedas follows:

A sample of alumina powder (8 g dry basis) is mixed with 99 mL of anaqueous 0.078 N nitric acid solution for 5 min in a blender. Theresulting slurry is analyzed with a Micromeritics Sedigraph® IIIinstrument (Micromeritics Instrument Corporation, Norcross, Ga.). Thecumulative mass percent of particles under 1 micron is calculated by theinstrument and reported as DPI. An alternative method of the test isdescribed, for example in U.S. Pat. No. 6,919,294, starting in col. 4,line 45 and is based on the amount of powder that remains suspendedversus the amount that is separated from the slurry by use of acentrifuge.

For purposes of the present invention useful DPI values are greater thanabout 40%; for example about 40% to equal to or less than about 100%;such as about 40% to about 90%; for example, about 45% to about 85%.

Alumina Support Properties

As described above, the powder is subsequently mixed with water andoptionally with recycled fines and an acid such as nitric acid andextruded to produce support particles such as in the form of pills,which are then dried and preferably calcined. In the description thatfollows, the product produced at this stage of the process is referredto as “alumina support particles”, catalyst support particles or“catalyst carrier particles” or simply “support” or “carrier” particles.

Several properties of the alumina support particles produced accordingto the synthesis methods described above are typically determined andgenerally characterize the particles. Various properties and testmethods are defined hereinabove and also referred to in the Examplesbelow. Typical values for several of the properties are summarized asfollows.

The total mercury pore volume of a sample is the sum of the mercury porevolumes as determined by the mercury penetration method described above.

Alumina support or carrier particles of the present invention have atotal pore volume (sometimes referred to a total intrusion volume, TIV,or total mercury pore volume, which refers to measurements made usingthe mercury intrusion method) in cc/g, of typically about 0.6 to about1.1 cc/g; preferably about 0.75 to about 0.95, preferably about 0.78 toabout 0.93, for example about 0.78 to about 0.85 cc/g.

Alumina support or carrier particles produced in accordance with thepresent invention have a total nitrogen surface area in m²/g, oftypically at least about 185, preferably at least about 195 and mostpreferably at least about 205 m²/g. In each instance, typical support orcarrier particles can exhibit a total nitrogen surface area of about 275m²/g.

The content of macropores of the carrier particles, namely pore sizesequal to or greater than 1000 Å measured using the mercury penetrationmethod, will be typically equal to or greater than 3% to less than orequal to 12%; preferably equal to or greater than 3% to less than orequal to about 10% and most preferably equal to or greater than 3% toless than or equal to about 8% of the total pore volume. For example, ineach of the expressed ranges, amounts “greater than” 3% can be 3.1%,3.2%, 3.3%, etc. expressed in tenths of a percent and including 4%, 5%,6%, 7% and so on.

The content of nitrogen mesopores of the carrier particles, namely poreshaving diameters of 200 Å to less than 1000 Å measured using the mercurypenetration method, will range typically from greater than about 2% toless than about 19%; preferably from about 2% to less than about 15%;and more preferably from about 3% to about 10% of the total pore volume.

The micropore content of the carrier particles measured using themercury penetration method, namely carrier particles exhibiting poreshaving diameters of less than 200 Å, will be typically greater thanabout 78%, preferably greater than about 80% and most preferably greaterthan about 85% of the total pore volume, which micropore content canrange typically from greater than about 78% to about 95%, and includingindividual values and alternative ranges within this range.

The carrier or support particles are further characterized in that theyexhibit a pore mode (also measured using the mercury penetration method)typically equal to or greater than about 90 Å and less than about 160 Å,preferably greater than about 100 Å and less than about 150 Å, morepreferably about 110 Å and less than about 140 Å.

Typically, catalyst carrier or support particles prepared according tothe present invention exhibit a substantially monomodal or unimodal poresize distribution (PSD) with the major peak corresponding to the poremode of the distribution. For purposes of the present inventionsubstantially unimodal means that the particles comprising a carrier orsupport exhibit substantially a single peak in a plot of volume of poresversus pore diameter (in Å). Such a distribution allows for one or moreadditional peaks at greater than about 200 Å provided that if suchadditional peak is present the total volume of pores comprised in suchadditional peak is greater than zero to about 10, 9, 8, 7, 6, 5, 4, 3,2, 1, 0.8, 0.6, 0.4, 0.2, 0.1, 0.08, 0.06, 0.04, 0.02, or 0.01% of thetotal pore volume present in the carrier or support. Preferably, only asingle discernible peak is present in the distribution. Alternatively, asecond peak may be present in an amount of greater than zero to about 5%of the total pore volume present.

The carrier or support particles are further characterized in that theyexhibit a d50 (also measured using the mercury penetration method)typically greater than about 100 Å and less than about 150 Å, preferablygreater than about 110 Å and less than about 140 Å, more preferablyabout 115 Å and less than about 135 Å.

A typical pore size distribution of a catalyst supported on a carrierprepared according to the present invention is illustrated in FIG. 1. Itwill be observed that the pore mode of this sample is between 100 Å and200 Å, specifically at about 130 Å.

Support particles can also typically be subjected to a thermalactivation treatment (also referred to as calcination) at a temperature,in ° C., in the range of typically from about 450 to about 1100,preferably from about 550 to about 1000, and most preferably from about600 to about 900° C. for periods of time in hours of typically fromabout 0.2 to about 3, preferably from about 0.3 to about 2, and mostpreferably from about 0.5 to about 1.5 hours. The atmosphere in whichactivation is conducted is typically air, but can include inert gasessuch as nitrogen.

Catalyst Preparation

Generally, hydroprocessing catalysts, especially ebullated bedhydroprocessing catalysts, can be produced using alternative methods. Inone method, alumina powder is mixed with water and then extruded to forma pelleted catalyst support. The support is dried and calcined, and Mometal and Ni metal precursors are impregnated onto the support. Theimpregnated wet pellets are then dried and calcined to provide finishedproducts. In another preparation method, alumina and catalytic metalprecursors, water, and additives such as extrusion aids, peptizingchemicals, and the like, are co-mixed and extruded into pellets. Themetal-containing wet pellets are then dried and calcined to produce thefinal catalyst.

Suitable catalysts can be prepared by impregnating a catalyst carrier,preferably an alumina carrier exhibiting the properties describedherein, using stabilized aqueous compositions and methods as describedin U.S. Pat. Nos. 7,390,766, 7,560,407 and 7, 642,212 (D. P. Klein,assigned to Advanced Refining Technologies), the disclosure of which isincorporated herein to the extent permitted. A suitable method andcomposition comprises adding to a suitable quantity of water: (A) atleast one substantially water insoluble Group 8, 9 or 10 metalcomponent; and (B) at least one substantially water-soluble,phosphorous-containing acidic component in an amount insufficient tocause dissolution of the at least one Group 8, 9 or 10 metal component,so as to produce a slurry typically at ambient temperature, andcombining the slurry with: (C) at least one Group 6 metal component; and(D) mixing the combination of (A), (B) and (C) and heating the mixture,for a time and to a temperature sufficient for (A), (B) and (C) to forma solution; and (E) adding an additional amount of water, if required,to obtain solution concentrations of at least one Group 8, 9 or 10metal, the at least one Group 6 metal and phosphorous useful forimpregnating the carriers; wherein Group 6 and Group 8, 9 and 10 referto Groups of the periodic table of the elements. In various preferredembodiments: the molar ratio of the at least one Group 8, 9 or 10 metalto Group 6 metal is about 0.05 to about 0.45, provided that the amountof the at least one Group 8, 9 or 10 metal is sufficient to promote thecatalytic effect of the Group 6 metal; the concentration of the Group 6metal, expressed as the oxide, is at least about 3 to about 50 weightpercent based on the weight of the composition; and the amount ofphosphorous-containing acidic component is sufficient to provide aphosphorous to Group 6 metal molar ratio of about 0.05 to less thanabout 0.25. In a still further embodiment, the process includes the stepof separating the volatile portion of the solution from the impregnateduncalcined carrier to obtain a dried catalyst having a desired moisturecontent.

“Pre-impregnated” catalyst refers to a catalyst in which themetals-containing solution or solutions are added before the foraminouscatalyst carrier is calcined. The metals-containing solution orsolutions can be added prior to or after shaping of the catalystparticle, but the important aspect is that the metals-containingsolution or solutions be added prior to the carrier material beingcalcined. However there are significant advantages to be gained byshaping of the uncalcined carrier after impregnation (contact) with anaqueous solution containing one or more catalytic metals. Theseadvantages are observed in the form of more desirable distribution ofthe metals throughout the carrier in the final catalyst. Thus, a“pre-impregnated” catalyst can be made as follows:

Uncalcined pseudoboehmite alumina powder is thoroughly mixed with water,or optionally with a dilute aqueous solution of nitric acid, and themixture is combined with a suitable quantity of a stable metalssolution. Such solution typically contains molybdenum, nickel andphosphorus, plus an optional additional quantity of metals solution ofone or more metals of Group 8, 9 and 10, if required in order to providethe desired amount of metals on the finished catalyst. Note that the oneor more metals of Group 8, 9 and 10, employed to achieve the optionaladditional quantity of the one or more metals of Group 8, 9 and 10, istypically selected to be water-soluble under the temperature conditionsencountered.

The metal-containing mixture, typically containing about 50 to about 65weight percent moisture, is shaped into catalyst particles having adesired size, preferably by extrusion. The formed catalyst particles aredried at a temperature of about 110 to about 150° C., and then calcinedat a temperature of about 500 to about 750° C. for about one to abouttwo hours.

“Post-impregnated” catalyst refers to a catalyst in which themetals-containing solution or solutions are added after the foraminouscatalyst carrier is calcined. The foraminous catalyst carrier can becalcined before or after shaping of the catalyst particle, but theimportant aspect is that the metals-containing solution or solutions beadded after the carrier material is calcined. Thus, a “post-impregnated”catalyst can be made as follows:

Uncalcined pseudoboehmite alumina powder is thoroughly mixed with water,or optionally with a dilute aqueous solution of nitric acid, and thealumina mixture, containing about 50 to 65 weight percent moisture, isthen formed into catalyst particles having a desired size and shape,preferably by extrusion. The formed particles are dried at a temperatureof about 110 to about 150° C., and then calcined at a temperature ofabout 400 to about 750° C. for about one to two hours. The dried andcalcined particles are contacted with a suitable quantity of a stablemetals solution. For example, such solution typically containsmolybdenum, nickel and phosphorus, plus an optional additional quantityof solution of one or more metals of Groups 8, 9 and 10 (also identifiedas Group VIII according to the CAS designation), if required, in orderto provide the desired amount of metals on the finished catalyst, whilesubstantially and uniformly filling the pores. After a suitable contacttime, the formed catalyst particles are dried at a temperature of about110 to about 150° C., and then calcined at a temperature of about 400 toabout 750° C. for about one to about two hours.

It will be observed that a significant distinction between apre-impregnated catalyst and a post-impregnated catalyst is that thepost-impregnated catalyst undergoes two calcining steps; typically oneconsisting essentially of the foraminous carrier and the second in whichthe carrier has been “loaded” with the catalytically active metalcomponents including the phosphorous component. In contrast, thepre-impregnated catalyst undergoes one calcining step, as described.

Suitable catalytically active elements or metals from Groups 8, 9 and 10present in components of the invention may include Fe, Co, Ni, Pd, Ptand the like and mixtures thereof. Of these, the most preferable are Coand Ni. Suitable Group VIB elements or metals include Cr, Mo, W, andmixtures thereof; most preferred are Mo and W. Preferred combinations ofmetal components comprise e.g., nickel and molybdenum, cobalt andmolybdenum, tungsten and nickel or cobalt, molybdenum and a combinationof cobalt and nickel, tungsten and a combination of nickel and cobalt, acombination of molybdenum and chromium and nickel, etc; the combinationof molybdenum and nickel is particularly preferred.

A suitable overall process for preparing a stable impregnating solutioncan be described as follows:

Basic nickel- and molybdenum-containing solutions can be prepared bycombining water, a molybdenum source, a nickel source and aqueousammonia in appropriate ratios. A variety of molybdenum and nickelsources may be used. For molybdenum, these include but are not limitedto: molybdenum trioxide, ammonium dimolybdate, and ammoniumheptamolybdate. For nickel, these include but are not limited to nickelcarbonate and nickel nitrate. The component weights can be varied toensure solution stability, as well as the proper concentration and ratioof metals. Component weights, order of addition, temperature andreaction times required are well-known to those skilled in the art.

The catalyst composition typically comprises about 5 to about 35 wt. %of the total of Group 6 and Group 8, 9 or 10 or mixtures thereof metalcomponents, calculated as oxides based on the total weight of thecatalyst composition; preferably, about 8 to about 30 wt. %, morepreferably about 10 to about 25 wt. %. The amount of Group VIB metalsand Group VIII metals can be determined using atomic absorptionspectrometry (AAS), inductively-coupled plasmaspectrometer (ICP)analysis and/or x-ray fluorescence (XRF).

The supported catalyst composition following impregnation, drying andcalcinations, i.e., wherein the metal components and phosphorus arepresent as oxides, and, preferably, prior to a sulfidation step, if any,exhibit the same or substantially the same properties described above.In other words, properties such as pore mode, d50 and percent of porevolume in various ranges described above, are typically substantiallythe same in the supported catalyst as in the support. Properties such astotal pore volume or total intrusion volume and surface area, which areexpressed on a unit weight basis will typically be substantially thesame provided that the values of the catalyst are expressed on a“metals-free basis” in order to account for the weight of the metalsthat are present. In these instances, “substantially the same” isunderstood to mean that the values are within about 15% of one another;for example within about 10%; including within about 5% of one another.

The term “agglomerate” refers to a product that combines particles thatare held together by a variety of physical-chemical forces and the term“shaping” and grammatical variations thereof refers to the act offorming agglomerates. More specifically, each agglomerate is composed ofa plurality of contiguous, constituent primary foraminous carrierparticles, preferably joined and connected at their points of contact.Thus, the agglomerates particles typically exhibit a higher macroporecontent than the constituent primary particles from which they are madebecause of the interparticle voids between the constituent compositeparticles. These larger voids are not included as part of thecharacterizing properties of the primary foraminous carrier particles,for example, specific pore sizes or ranges and pore size distributioncharacteristics.

Agglomeration of the foraminous carrier, e.g., alumina, composite iscarried out in accordance with methods well known to the art, and, inparticular, by such methods as pelletizing, extrusion, shaping intobeads in a rotating coating drum, and the like. The modulizing techniquewhereby composite particles having a diameter of not greater than about0.1 mm are agglomerated to particles with a diameter of at least about0.8 mm by means of a granulation liquid may also be employed. As isknown to those skilled in the art, agglomeration may optionally becarried out in the presence of additional amorphous or crystallinebinders, and pore-forming agents may be added to the mixture to beagglomerated. Conventional binders include other forms of alumina,silica, silica-alumina, clays, zirconia, silica-zirconia, magnesia andsilica-boria. Conventional pore-forming agents which can be used inparticular, include wood flour, wood charcoal, cellulose, starches,naphthalene and, in general, all organic compounds capable of beingremoved by calcination. The addition of pore forming agents, however, isnot necessary or desirable.

The catalyst composition may have different shapes selected for theirsuitability for the process and/or equipment in which they are to beused. For example, if the catalyst composition is to be used inslurry-type reactors, fluidized beds, moving beds, or expanded beds,generally spray-drying or beading is applied. For fixed bed orebullating bed applications, generally the catalyst composition isextruded, pelletized and/or beaded. In the latter case, at any stageprior to or during the shaping step, any additives, which areconventionally used to facilitate shaping, can be added. These additivesmay comprise aluminum stearate, surfactants, graphite, starch, methylcellulose, bentonite, polyethylene glycols, polyethylene oxides ormixtures thereof. Further, as discussed elsewhere, when alumina is usedas the carrier, nitric acid is sometimes added prior to the shaping stepfor the purpose of, e.g., increasing the mechanical strength of theagglomerates. In the present invention the shaping step is carried outin the presence of water. For extrusion and beading, the amount of waterin the shaping mixture, expressed as LOI, preferably is in the range of20-80%. If required by the shaping operation, additional water can beadded or, if the amount of water is too high, it can be reduced by,e.g., solid-liquid separation via, e.g., filtration, decantation, orevaporation. It is within the scope of the skilled person to control theamount of water appropriately.

Suitable shapes include powders, spheres, cylinders, rings, andsymmetric or asymmetric polylobal forms, for instance tri- andquadrilobal. Particles resulting from extrusion, beading or pelletingusually have a diameter in the range of about 0.2 to about 10 mm, andlengths in the range of about 0.5 to about 20 mm, but deviations fromthese general ranges are possible. Catalysts in the form of extrudatesare generally preferred.

The present invention is also directed to catalyst compositionsaccording to the invention wherein the metal components have beenconverted partly or wholly into their sulfides. In that case, it ispreferred for the catalyst to be essentially free from Group VIII metaldisulfides.

Calcination is generally carried out at a temperature typically about200 to about 850° C.; preferably about 350 to about 800° C.; morepreferably about 450 to about 750° C. The calcination time generallyvaries from about 0.5 to about 48 hours. Calcination temperatures formetals-containing (especially post-impregnated) supports or carriers aretypically lower than those used for a support or carrier per se. Thecalcination may be carried out in an inert gas such as nitrogen, or inan oxygen-containing gas, such as air or pure oxygen, and optionally inthe presence of steam. Preferably, the calcination is carried out in anoxygen-containing atmosphere.

Catalysts prepared by the methods described herein typically alsoexhibit a loss on ignition (LOI), measured at either 1000° F. or 1200°F. typically less than about 5 wt. %; preferably less than about 3 wt.%; more preferably less than about 2 wt. %.

Additionally, the physical characteristics of the finished catalyst caninclude the following properties, which are expected to be substantiallythe same as the alumina carrier particle from which the catalyst ismade, each of these properties having been described above, namelysurface area (SA), total intrusion volume (TIV) and pore mode. As notedabove, SA and TIV should be expressed on a “metals free basis” forsubstantial similarity to apply.

Furthermore, catalysts according to the invention are particularlyuseful in hydrocarbon conversion processes comprising contacting ahydrocarbon feedstock with a particulate catalyst under conditions ofelevated temperature and elevated pressure with hydrogen, wherein thecatalyst is made according to the present invention. As generallydescribed, such catalysts comprise at least one catalytically activemetal from Group 6 of the periodic table, at least one catalyticallyactive metal from Group 8, 9 and 10 of the periodic table, andoptionally phosphorous, wherein the metals and optionally phosphorousare carried on the preferred alumina carrier described above and thepore mode and other particle properties are also as described.

Use of the Catalysts in Hydroprocessing Processes

Catalysts prepared according to the present invention can be used invirtually all hydroprocessing processes to treat a plurality of feedsunder wide-ranging reaction conditions, generally, for example, attemperatures in the range of about 200° to about 500° C., hydrogenpressures in the range of about 5 to 300 bar, and liquid hourly spacevelocities (LHSV) in the range of about 0.05 to 10 h⁻¹. The term“hydroprocessing” can encompass various processes in which a hydrocarbonfeed is reacted with hydrogen at elevated temperature and elevatedpressure (hydroprocessing reaction conditions), including hydrogenation,hydrodesulfurization, hydrodenitrogenation, hydrodemetallization,hydrodearomatization, hydrocracking, and hydrocracking under mildpressure conditions, which is also referred to as mild hydrocracking.

More specifically, “hydroprocessing” as the term is employed hereinmeans oil refinery processes for reacting petroleum feedstocks (complexmixtures of hydrocarbon present in petroleum) with hydrogen underpressure in the presence of a catalyst to lower: (a) the concentrationof at least one of sulfur, contaminant metals, nitrogen, and Conradsoncarbon, present in said feedstock, and (b) at least one of theviscosity, pour point, and density of the feedstock. Hydroprocessingincludes hydrocracking, isomerization/dewaxing, hydrofinishing, andhydrotreating processes which differ by the amount of hydrogen reactedand the nature of the petroleum feedstock treated.

Hydrofinishing is typically understood to involve the hydroprocessing ofhydrocarbonaceous oil containing predominantly (by weight of)hydrocarbonaceous compounds in the lubricating oil boiling range(“feedstock”) wherein the feedstock is contacted with solid supportedcatalyst at conditions of elevated pressure and temperature for thepurpose of saturating aromatic and olefinic compounds and removingnitrogen, sulfur, and oxygen compounds present within the feedstock, andto improve the color, odor, thermal, oxidation, and UV stability,properties of the feedstock.

Hydrocracking is typically understood to involve the hydroprocessing ofpredominantly hydrocarbonaceous compounds containing at least five (5)carbon atoms per molecule (“feedstock”) which is conducted: (a) atsuperatmospheric hydrogen partial pressure; (b) at temperaturestypically below 593.3° C. (1100° F.); (c) with an overall net chemicalconsumption of hydrogen; and (d) in the presence of a solid supportedcatalyst containing at least one (1) hydrogenation component.

Hydrotreating is typically understood to involve the hydroprocessing ofpredominantly hydrocarbonaceous compounds containing at least fivecarbon atoms per molecule (“feedstock”) for the desulfurization and/ordenitrification of said feedstock, wherein the process is conducted: (a)at superatmospheric hydrogen partial pressure; (b) at temperaturestypically below 593.3° C. (1100° F.); (c) with an overall net chemicalconsumption of hydrogen; and (d) in the presence of a solid supportedcatalyst containing at least one hydrogenation component.

A further embodiment of the present invention is directed to a processfor the hydrotreating of a hydrocarbon feedstock in at least oneebullated bed reaction zone. More particularly, the hydrocarbonfeedstock is contacted with hydrogen in one or a series of ebullated bedreaction zones in the presence of a hydroprocessing catalyst comprisinga catalyst as described herein.

As is well known these feedstocks contain nickel, vanadium, andasphaltenes, e.g., about 40 ppm up to more than 1,000 ppm for thecombined total amount of nickel and vanadium and up to about 25 wt. %asphaltenes. Further, the economics of these processes desirably producelighter products as well as a demetallized residual by-product. Thisprocess is particularly useful in treating feedstocks with a substantialamount of metals containing 150 ppm or more of nickel and vanadium andhaving a sulfur content in the range of about 1 wt. % to about 10 wt. %.Typical feedstocks that can be treated satisfactorily by the process ofthe present invention contain a substantial amount (e.g., about 90%) ofcomponents that boil appreciably above 537.8° C. (1,000° F.). Examplesof typical feedstocks are crude oils, topped crude oils, petroleumhydrocarbon residua, both atmospheric and vacuum residua, oils obtainedfrom tar sands and residua derived from tar sand oil, and hydrocarbonstreams derived from coal. Such hydrocarbon streams containorganometallic contaminants which create deleterious effects in variousrefining processes that employ catalysts in the conversion of theparticular hydrocarbon stream being treated. The metallic contaminantsthat are found in such feedstocks include, but are not limited to, iron,vanadium, and nickel.

While metallic contaminants, such as vanadium, nickel, and iron, areoften present in various hydrocarbon streams, other metals are alsopresent in a particular hydrocarbon stream. Such metals exist as theoxides or sulfides of the particular metal, or as a soluble salt of theparticular metal, or as high molecular weight organometallic compounds,including metal naphthenates and metal porphyrins, and derivativesthereof.

Another characteristic phenomenon of hydrotreating heavy hydrocarbons isthe precipitation of insoluble carbonaceous substances or sediment fromthe asphaltenic fraction of the feedstock which cause operabilityproblems. Sediment can deposit on and inside various pieces of equipmentdownstream of the hydroproces sing unit and interferes with properfunctioning of pumps, heat exchangers, fractionating towers, etc.Production of excessive amounts of sediment is undesirable in thatdeposition in downstream units typically requires shut-down of equipmentto remove the sediment. The amount of such sediment or insolubles formedincreases with the amount of material boiling over 537.8° C. (1,000° F.)which is converted or with an increase in the reaction temperatureemployed. These insoluble substances, also known as Shell hot filtrationsolids, create the operability difficulties for the hydroconversion unitand thereby circumscribe the temperatures and feeds the unit can andle.In other words, the amount of solids formed limit the conversion of agiven feedstock. Operability difficulties as described above may beginto manifest themselves at solids levels as low as 0.1 wt. %. Levelsbelow 0.5 wt. % are generally desired to prevent fouling of processequipment. A description of the Shell hot filtration test is found at A.J. J., Journal of the Inst. of Petroleum (1951) 37, pp. 596-604 by VanKerkvoort, W. J. and Nieuwstad, A. J. J. which is incorporated herein byreference. Another useful test method for the determination of totalsediment is described in ASTM D 4870-92.

Hydrotreating operations are typically carried out in one or a series ofebullated bed reactors. As previously elucidated, an ebullated bed isone in which the solid catalyst particles are kept in random motion bythe upward flow of liquid and gas. An ebullated bed typically has agross volume of at least 10 percent greater and up to 70% greater thanthe solids thereof in a settled state. The required ebullation of thecatalyst particles is maintained by introducing the liquid feed,inclusive of recycle if any, to the reaction zone at linear velocitiesranging from about 0.02 to about 0.4 feet per second and preferably,from about 0.05 to about 0.20 feet per second.

The operating conditions for the hydrotreating of heavy hydrocarbonstreams, such as petroleum hydrocarbon residua and the like, are wellknown in the art and comprise a pressure within the range of about 1,000psia (68 atm) to about 3,000 psia (204 atm), an average catalyst bedtemperature within the range of about 700° F. (371° C.) to about 850° F.(454° C.), a liquid hourly space velocity (LHSV) within the range ofabout 0.1 volume of hydrocarbon per hour per volume of catalyst to about5 volumes of hydrocarbon per hour per volume of catalyst, and a hydrogenrecycle rate or hydrogen addition rate within the range of about 2,000standard cubic feet per barrel (SCFB) (356 m³/m³) to about 15,000 SCFB(2,671 m³/m³). Preferably, the operating conditions comprise a totalpressure within the range of about 1,200 psia to about 2,000 psia(81-136 atm); an average catalyst bed temperature within the range ofabout 730° F. (387° C.) to about 820° F. (437° C.); and a LHSV withinthe range of about 0.1 to about 4.0; and a hydrogen recycle rate orhydrogen addition rate within the range of about 5,000 SCFB (890 m³/m³)to about 10,000 SCFB (1,781 m³/m³). Generally, the process temperaturesand space velocities are selected so that at least 30 vol. % of the feedfraction boiling above 1,000° F. is converted to a product boiling below1,000° F., more preferably at least 50 vol. % is converted to a productboiling below 1,000° F., and still more preferably so that at least 70vol. % of the subject fraction is converted to a product boiling below1,000° F.

For the treatment of hydrocarbon distillates, the operating conditionswould typically comprise a hydrogen partial pressure within the range ofabout 200 psia (13 atm) to about 3,000 psia (204 atm); an averagecatalyst bed temperature within the range of about 600° F. (315° C.) toabout 800° F. (426° C.); a LHSV within the range of about 0.4 volume ofhydrocarbon per hour per volume of catalyst to about 6 volumes ofhydrocarbon recycle rate or hydrogen addition rate within the range ofabout 1,000 SCFB (178 m³/m³) to about 10,000 SCFB (1,381 m³/m³).Preferred operating conditions for the hydrotreating of hydrocarbondistillates comprise a hydrogen partial pressure within the range ofabout 200 psia (13 atm) to about 1,200 psia (81 atm); an averagecatalyst bed temperature within the range of about 600° F. (315° C.) toabout 750° F. (398° C.); a LHSV within the range of about 0.5 volume ofhydrocarbon per hour per volume of catalyst to about 4 volumes ofhydrocarbon per hour per volume of catalyst; and a hydrogen recycle rateor hydrogen addition rate within the range of about 1,000 SCFB (178m³/m³) to about 6,000 SCFB (1,068 m³/m³).

The most desirable conditions for conversion of a specific feed to apredetermined product, however, can be best obtained by converting thefeed at several different temperatures, pressures, space velocities andhydrogen addition rates, correlating the effect of each of thesevariables and selecting the best compromise of overall conversion andselectivity. The catalyst composition of the invention is particularlysuitable for hydrotreating heavy hydrocarbon feedstocks.

All parts and percentages in the examples, as well as in the remainderof the specification, are by weight unless otherwise specified.

EXAMPLES

In each of the following examples, precipitated alumina powders arepseudoboehmite.

Example 1 Alumina Powder No. 1

A strike tank (vessel) was filled with water (7700 gal) and heated to123° F. Then aluminum sulfate (15.4 gpm of 8.2% Al₂O₃ solution) andsodium aluminate (9.8 gpm on average of 25% Al₂O₃ solution) were addedto the strike tank. The aluminum sulfate was introduced at a fixed rateof 15.4 gallons per minute (gpm) but the sodium aluminate flow rate wasadjusted to maintain a solution pH of 9.1 during the strike. The flowrates of sodium aluminate and aluminum sulfate were continued for 60minutes, maintaining the pH and temperature of the strike solution ormixture, in other words the contents of the strike tank, at 9.1 and 123°F., respectively. During this time, alumina powder precipitated in thestrike tank resulting in an alumina slurry. After 60 minutes the flow ofeach of the reactants was stopped and the slurry was pumped to a beltfilter where the resulting powder was washed and filtered on a clothbelt. The resulting filter cake was fed to a spray dryer and dried to27% total volatiles. The dried powder was collected and used forcatalyst synthesis. Properties of the powder are summarized in Table 1,below.

Example 2 Alumina Powder No. 2

A strike tank was filled with water (4217 gal) and heated to 125° F.Then aluminum sulfate (9.2 gpm of 8.2% A₂O₃ solution) diluted with water(22.1 gpm) and sodium aluminate (6.8 gpm at an average of 25% A₂O₃solution) diluted with water (35.3 gpm) were added to the strike tank.The aluminum sulfate was introduced at a fixed flow rate (9.2 gpm), butthe sodium aluminate flow rate was varied to maintain a solution pH of9.1 during the strike. The flow rates of sodium aluminate and aluminumsulfate were continued for 60 minutes maintaining the strike solution pHand temperature at 9.1 and 123° F., respectively. During this time,alumina powder precipitated in the strike tank resulting in an aluminaslurry. After 60 minutes the flow of each reactant was stopped and theslurry was pumped to a belt filter where the resulting powder was washedand filtered on a cloth belt. The resulting filter cake was then fed toa spray dryer and dried to 25% total volatiles. The dried powder wascollected and used for catalyst synthesis. Properties of the powder aresummarized in Table 1, below.

Example 3 Alumina Powder No. 3

The alumina powder of this example is a commercially producedpseudoboehmite. It is similar to powders disclosed in U.S. Pat. No.4,154,812. Properties of the powder are summarized in Table 1, below.

TABLE 1 Properties of Alumina Powders Powder of Example No. 1 2 3Property Al₂O₃, wt. % >98 >99 >98 Na₂O, wt. % 0.06 0.04 0.03 SO₄, wt. %1.2 0.4 0.7 Total Volatiles, wt. % 26.1 24.0 29.8 DPI (%) 66 48 29Average Particle Size, μm 29.2 — — Surface Area, m²/g 369 351 347 TotalPore Volume, cc/g 1.27 1.27 1.01

Surface area and total pore volume were determined using nitrogen andthe BET method described earlier.

Higher values of total pore volume are preferred, as in powders 1 and 2above; ultimately, properties of the support and supported catalyst aredeterminative of acceptable products. Furthermore, as described above,higher values of DPI are preferred, typically about 40% and higher.

Preparation of Supported Catalysts

Generally, catalyst metal impregnating solutions are prepared asfollows:

Nickel and molybdenum containing solutions are created by combiningwater, a molybdenum source, a nickel source and aqueous ammonia inappropriate ratios. As described above, various molybdenum and nickelsources may be used including, but not limited to: molybdenum trioxide,ammonium dimolybdate, ammonium heptamolybdate, nickel carbonate andnickel nitrate. The solutions are then used to impregnate a calcinedalumina support in order to prepare the finished catalyst. The componentweights and order of addition are selected to ensure solution stabilityand the proper concentrations of metals on the finished catalyst for theintended catalyst use. Solution treatment temperatures and times areselected to ensure solution stability. Component weights, order ofaddition, treatment temperatures and treatment times required aretypical and generally known to those skilled in the art.

Example 4 Catalyst Impregnating Metal Solution

Water (1000 g) was added to a glass kettle equipped with a heatingmantle and overhead stirrer. Agitation was started and the water washeated to 120° F. After the water reached 120° F., ammonium dimolybdatecrystals (235 g) were added to the kettle. Next, 28% aqueous ammonia(212 g) was slowly added to the kettle. Finally, nickel carbonate (81 g)was added to the kettle and the resulting solution was heated to 140° F.and held at temperature for one hour. The kettle was then allowed tocool before ceasing agitation.

Catalyst Preparation

Example 5

Alumina powder no. 2 as described above (820 lbs) was placed into anEirich mixer along with metal-free and metal-containing recycle fines(75 and 20 lbs, respectively). A wet-mix was formed by adding water(1210 lbs) into the mixer. The wet-mix was mixed for 18 minutes and thenextruded through a 4 inch Bonnot single auger extruder using dies withnominal 1 mm holes. The formed catalyst support particles were dried at250° F. before being calcined at 1200° F. for 40 minutes.

The finished catalyst was prepared by impregnating the calcined supportwith a metals solution similar to that in Example 4 using the incipientwetness technique. The weights or amounts of water, metal solution andcalcined support were selected such that the desired finished catalystmetal concentrations were obtained and the point of incipient wetnesswas reached. The required weights are readily determined by thoseskilled in the art. The impregnated extrudates were then calcined at950° F. for 40 minutes to form the finished catalyst.

Example 6

Alumina powder no. 2, as described above, (1833 grams) was placed into a10 liter Eirich Model R02 mixer. A wet-mix was formed by adding to themixer a dilute nitric acid solution prepared from 75% nitric acid (18 g)and water (2236 g). The wet-mix was mixed on the low speed setting for 1minute and on the high speed setting for 3 minutes. The wet-mix was thenextruded through a 4 inch Bonnot single auger extruder using dies withnominal 1 mm holes. The formed catalyst support particles were driedovernight at 250° F. before being calcined at 1600° F. for 90 minutes.

The finished catalyst was made by impregnating the calcined support witha metals solution similar to that in Example 4 using the incipientwetness technique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 1000° F. for 30 minutes toform the finished catalyst.

Example 7

Alumina powder no. 2, as described above, (820 lbs) was placed into anEirich mixer along with metal-free and metal-containing recycle fines(75 and 20 lbs, respectively). A wet-mix was formed by adding water(1210 lbs) into the mixer. This wet-mix was mixed for 18 minutes. Thewet-mix was then extruded through a Bonnot single auger extruder usingdies with nominal 1 mm holes. The formed catalyst particles were driedat 250° F. before being calcined at 1800° F. for one hour in a mufflefurnace.

The finished catalyst was made by impregnating calcined base with metalssolution similar to that in Example 4 using the incipient wetnesstechnique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 950° F. for 60 minutes.

Example 8

Alumina powder no. 1, as described above, (2750 grams) was placed into a10 liter Eirich R02 mixer. A wet-mix was formed by adding a dilutenitric acid solution prepared from 75% nitric acid (28 g) and water(3216 g) into the mixer. This wet-mix was mixed on the low speed settingfor 1 minute and on the high speed setting for 3 minutes. The wet-mixwas then extruded through a 4 inch Bonnot single auger extruder usingdies with nominal 1 mm holes. The formed catalyst particles were driedovernight at 250° F. before being calcined at 1450° F. for 40 minutes.

The finished catalyst was made by impregnating calcined base with metalssolution similar to that in Example 4 using the incipient wetnesstechnique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 950° F. for 40 minutes.

Example 9

Alumina powder no. 1, as described above, (2750 grams) was placed into a10 liter Eirich R02 mixer. A wet-mix was formed by adding to the mixer adilute nitric acid solution prepared from 75% nitric acid (28 g) andwater (3216 g). The wet-mix was mixed on the low speed setting for 1minute and on the high speed setting for 3 minutes. The wet-mix was thenextruded through a 4 inch Bonnot single auger extruder using dies withnominal 1 mm holes. The formed catalyst particles were dried overnightat 250° F. before being calcined at 1450° F. for 40 minutes.

The finished catalyst was made by impregnating calcined base with metalssolution similar to that in Example 4 using the incipient wetnesstechnique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 950° F. for 40 minutes.FIG. 1 illustrates the pore size distribution of the catalyst.

Example 10

Alumina powder no. 1 (3870 grams), commercially available, metals-freegamma alumina recycle fines (410 g), 75% nitric acid (240 g) and water(5480 g) were mixed in a low-shear mixer to form a wet-mix. The wet-mixwas then extruded through a single auger extruder using dies withnominal 1 mm holes. The formed catalyst particles were dried at 290° F.before being calcined at 1400° F.

The finished catalyst was made by impregnating calcined base with ametals solution similar to that in Example 4 using the incipient wetnesstechnique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 800° F.

Example 11—Comparative

Alumina powder no. 3, as described above, (1145 grams) was placed intoan Eirich mixer. A wet-mix was formed by adding 7 g of nitric acid and1170 g de-ionized water to the alumina powder. This wet-mix was mixed onthe low speed setting for 1 minute and on the high speed setting for 3minutes. Then 283 g of a second pseudoboehmite alumina powder(substantially the same as powder no. 3) was added to the Eirich mixerbefore mixing on high for 3 minutes. The wet-mix was then extrudedthrough a Bonnot single auger extruder using dies with nominal 1 mmholes. The formed catalyst particles were dried overnight at 250° F.before being calcined at 1200° F. for one hour.

The finished catalyst was made by impregnating calcined base with metalssolution similar to that in Example 4 using the incipient wetnesstechnique. Water, metal solutions and calcined base weights wereselected such that the desired finished catalyst metal concentrationswere obtained and the point of incipient wetness was reached. Therequired weights are readily determined by those skilled in the art. Theimpregnated extrudates were then calcined at 950° F. for 60 minutes.

Example 12 (Comparative)

Pseudoboehmite alumina powder no. 2, as above, (820 lbs) was placed intoan Eirich mixer along with metal-free and metal-containing recycle fines(75 and 20 lbs, respectively). A wet-mix was formed by adding water(1210 lbs) into the mixer. This wet-mix was mixed for 18 minutes. Thewet-mix was then extruded through a Bonnot single auger extruder usingdies with nominal 1 mm holes. The formed catalyst support particles weredried at 250° F. before being calcined at 1600° F. for 1 hour in amuffle furnace.

The finished catalyst was made by impregnating calcined base with metalssolution using the incipient wetness technique. Water, metal solutionsand calcined base weights were selected such that the desired finishedcatalyst metal concentrations were obtained and the point of incipientwetness was reached. The required weights are readily determined bythose skilled in the art. The impregnated extrudates were then calcinedat 950° F. for 60 minutes.

Example 13 (Comparative)

Pseudoboehmite alumina powder no. 3, as described above, (1428 grams)was mixed with methocel (93 g) and placed into an Eirich mixer. Awet-mix was formed by adding 7 g of nitric acid and 1168 g de-ionizedwater to the alumina powder. This wet-mix was mixed on the low speedsetting for 1 minute and on the high speed setting for 3 minutes. Thewet-mix was then extruded through a Bonnot single auger extruder usingdies with nominal 1 mm holes. The formed catalyst particles were driedovernight at 250° F. before being calcined at 1200° F. for one hour.

The finished catalyst was made by impregnating calcined base with metalssolution using the incipient wetness technique. Water, metal solutionsand calcined base weights were selected such that the desired finishedcatalyst metal concentrations were obtained and the point of incipientwetness was reached. The required weights are readily determined bythose skilled in the art. The impregnated extrudates were then calcinedat 950° F. for 60 minutes.

TABLE 2 Catalyst Metal Composition MoO₃ NiO Example (wt. %) (wt. %)Ref.* 14.7 5.0  5 9.1 1.9  6 8.3 1.8  7 8.3 1.7  8 8.3 1.8  9 10.2 1.610 11.3 1.8 11 (C) 8.3 1.7 12 (C) 8.3 1.7 13 (C) 8.8 1.5 *Referencecatalyst: Commercial, state of the art catalyst prepared according tothe disclosure of U.S. Pat. No. 7,642,212; (C) refers to ComparativeExample as described above.

TABLE 3 Supported Catalyst Properties SA Pore Exam- (m²/ TIV* d50 Mode %PV % PV % PV ple g) (cc/g) (Å) (Å) <200 Å ≧1000 Å 200-<1000 Å Ref. 2970.75 59 55 65 21 14  5 225 0.76 117 122 93 3 4  6 198 0.75 126 130 83 314  7 180 0.75 143 147 89 3 8  8 216 0.84 122 124 87 5 8  9 207 0.79 123130 88 4 8 10 218 0.78 112 113 86 5 9 11 (C) 222 0.87 116 113 75 12 1312 (C) 179 0.80 143 151 76 9 15 13 (C) 261 0.87 100 84 82 3 15 *Totalpore volume as measured by mercury intrusion method; (C) refers toComparative Example as described above.

The active catalysts prepared as described above were evaluated forperformance Catalyst performance was evaluated in a fixed bed pilotplant using the following operating conditions which are described infurther detail in U.S. Pat. No. 7,390,766 (incorporated herein to theextent permitted):

1. 100 cc of catalyst is charged to the pilot plant reactor.

2. The catalyst is heated to 350° F. in nitrogen and then hydrogen forcatalyst dryout, followed by catalyst pre-sulfiding.

3. The pilot plant is operated at 0.6 LHSV and 780° F. for 3-4 days tostabilize the catalyst system. The operating condition is then changedto 0.2 LHSV and 790° F. to collect catalyst performance data. The pilotplant remains at this condition for 14-21 days in order to study thelong-term deactivation behavior of the catalyst.

4. The liquid product is collected daily and analyzed for API, sulfur,MCR, nitrogen, metals, 1000F+ and sediment.

Performance was evaluated considering the following properties asreported in Tables 4 and 5 below: MCR, micro carbon residue, which isdescribed in ASTM Method D4530; sediment, test method ASTM D4870 (alsoreferred to in U.S. Pat. No. 5,928,499, Column 13, lines 31-42,incorporated herein by reference to the extent permitted).

Percent conversion for all parameters is calculated using the followingequation:

[(amount X in feed-amount X in product)/amount X in feed]*100

For example, in the case of 1000° F.+ conversion in percent, it would bethe volume of 1000° F.+ boiling material in the feed minus the volume of1000° F.+ boiling material in the product (over that same period oftime); this quantity is divided by the volume of 1000° F.+ boilingmaterial in the feed, the quantity multiplied by 100.

The same calculation procedure is used for sulfur and MCR.

As for sediment, sediment is the insoluble material (captured byfiltration) that is found in the feed or product. This is to becontrasted with carbon residue which is the material left afterpyrolyzing the feed or product. The sediment level for the residfeedstock is very low. There are both sediment molecules and sedimentprecursor molecules in the feed, but the sediment molecules are solublein the feed and therefore are not captured via filtration. Uponconversion of the 1000° F.+ materials, the sediment precursor moleculesbecome sediment molecules and it is believed that the solubilityproperties of the converted product are diminished compared to the feed.Therefore, more severe operations lead to higher observed sediment. Moresevere operations generally refers to, for example, increased conversionlevels, operating at higher temperature which can lead to increasedratio of thermal to catalytic cracking, increased levels ofdemetallation (such as nickel and vanadium), etc. In the present contextit refers to increased conversion. Less sediment is observed with betterperforming catalysts and, without wishing to be bound by theory, this isbelieved due to either production of fewer sediment molecules orconversion of the feed in such a way that the products have bettersolubility properties, or both.

Feedstock Used for Tests

Feedstock Type Ural Vacuum Resid Property Value API Gravity 7.4 1000°F.+, wt. % 88.7 Sulfur, wt. % 3.04 Total Nitrogen, wppm 5889 MCR, wt. %17.5 Pentane Insolubles, wt. % 12.38 Heptane Insolubles, wt. % 5.12Metals, wppm Ni 65.9 V 206 Na <1 D1160, wt % (° F.)* IBP 799  5% 947 10%991 20% 1046 30% 1089 40% 1130 50% 1176 *ASTM D1160-06 Standard TestMethod for Distillation of Petroleum Products at Reduced Pressure; IBP =Initial Boiling Point. As described by the ASTM, this test method isused for the determination of the distillation characteristics ofpetroleum products and fractions that may decompose if distilled atatmospheric pressure.This boiling range is obtained at conditionsdesigned to obtain approximately one theoretical plate fractionation.

Performance of the catalysts at equivalent conversion is reported inTable 4 below. In each instance it can be seen that the catalystexamples of the invention performed better than the comparativecatalyst, in other words, improved 1000° F.+ conversion at equivalentsediment formation, improved sulfur conversion, and improvedmicro-carbon residue conversion, particularly at extended run length.

TABLE 4 Catalyst Performance Alumina Resid Example Powder Conversion HDSHDMCR Sediment Ref. — 72.3 80.8 53.8 2696  5 2 75.5 88.2 64.0 2421  6 275.5 86.3 61.5 2178  7 2 76.2 87.2 64.4 2726  8 1 76.5 87.5 61.7 3327  91 76.1 87.4 62.3 2924 10 1 76.0 88.5 63.1 3216 11 (C) 3 71.9 79.0 53.41902 12 (C) 2 72.6 83.1 57.9 2913 13 (C) 3 73.2 85.9 61.1 3442 (C)refers to Comparative Example as described above

Alternative Embodiments

The following enumerated paragraphs illustrate various and alternativeembodiments of the present invention:

1. A supported catalyst comprising at least one metal from Group 6,alternatively referred to as Group VIB, of the Periodic Table of theElements, at least one metal from Groups 8, 9 or 10, alternativelyreferred to as Group VIII, of the Periodic Table of the Elements, andoptionally comprising phosphorous, wherein said metals, and phosphorouswhen present, are carried on a foraminous carrier or support, saidcarrier or support having a total pore volume (TPV) of about 0.6 cc/g toabout 1.1 cc/g and comprising:

-   -   (a) equal to or greater than about 78% to about 95% of TPV in        pores having a diameter of less than 200 Angstroms (Å);    -   (b) greater than about 2% to less than about 19% of TPV in pores        having a diameter of 200 (Å) to less than 1000 Å;    -   (c) equal to or greater than 3% to less than 12% of TPV in pores        having a diameter equal to or greater than 1000 Å; and    -   (d) a pore mode equal to or greater than about 90 Å and less        than about 160 Å.

2. A composition as in paragraph 1 further characterized in that saidsupport exhibits a d50 greater than about 100 Å and less than about 150Å.

3. A composition as in paragraph 1 further characterized in that greaterthan about 5% to less than about 19% of TPV is in pores having adiameter of 200 Å to less than 1000 Å.

4. A composition as in paragraph 1 further characterized in that equalto or greater than about 3% to less than about 10% of said TPV is inpores having a diameter equal to or greater than 1000 Å.

5. A composition as in paragraph 4 further characterized in that equalto or greater than about 5% to less than about 10% of said TPV is inpores having a diameter equal to or greater than 1000 Å.

6. A composition as in paragraph 1 wherein said foraminous carrierexhibits a substantially unimodal pore size distribution measured usingmercury porosimetry.

7. A composition as in paragraph 6 wherein said pore size distributionincludes an additional peak at greater than about 200 Å provided thatthe total volume of pores comprised in such additional peak is greaterthan about zero to about 10% of the total pore volume present in saidporous alumina.

8. A composition as in paragraph 1 further characterized in that saidmetal of Group 6 is molybdenum and said metal of Groups 8, 9 and 10 isselected from the group consisting of cobalt, nickel and mixturesthereof.

9. A composition as in paragraph 8 further comprising phosphorous.

10. A catalyst useful in at least one process selected from the groupconsisting of:

-   -   (I) hydroprocessing a petroleum feed;    -   (II) hydrodesulfurization of hydrocarbons;    -   (III) hydrodenitrification of hydrocarbons;    -   (IV) hydrodemetallation of hydrocarbons; and    -   (V) hydrotreating a charge hydrocarbon feed containing        components boiling above 1000° F., and at least one component        components selected from the group consisting of        sulfur-containing compounds, nitrogen-containing compounds,        metal-containing compounds, asphaltenes, carbon residue,        sediment precursors, and mixtures thereof, ;        said catalyst comprising at least one metal from Group 6,        alternatively referred to as Group VIB, of the Periodic Table of        the Elements, at least one metal from Groups 8, 9 or 10,        alternatively referred to as Group VIII, of the Periodic Table        of the Elements, and optionally comprising phosphorous, wherein        said metals, and phosphorous when present, are carried on a        foraminous carrier or support, wherein: said support exhibits a        total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and        pore size distribution and contents corresponding to values as        measured by the mercury porosimetry method:    -   (1) equal to or greater than about 78% to about 95% of TPV in        pores having a diameter of less than 200 Angstroms (Å);    -   (2) greater than about 2% to less than about 19% of TPV in pores        having a diameter of 200 Angstroms (Å) to less than 1000 A; and    -   (3) equal to or greater than 3% to less than 12% of TPV in pores        having a diameter equal to or greater than 1000 A; and    -   (4) a pore mode equal to or greater than about 90 Å and less        than about 160 Å.

11. The catalyst of paragraph 10 wherein said catalyst has beenpre-impregnated, shaped, dried and calcined.

12. The catalyst of paragraph 10, further exhibiting a d50 greater thanabout 100 Å and less than about 150 Å.

13. A process for treating a hydrocarbon feedstock to produce treatedproducts, said process selected from the group consisting of:

-   -   (I) hydrodemetallation, hydrodenitrification,        hydrodesulfurization, and hydrocracking, said process comprising        contacting said feedstock in at least one reactor with hydrogen        under hydrocracking conditions with a catalyst and recovering        said product;    -   (II) hydrotreating said hydrocarbon feed containing components        boiling above 1000° F., and at least one component selected from        the group consisting of sulfur-containing compounds,        nitrogen-containing compounds, metal-containing compounds,        asphaltenes, carbon residue, sediment precursors, and mixtures        thereof, comprising contacting said feed with hydrogen and a        catalyst at isothermal or substantially isothermal hydrotreating        conditions and recovering said treated product;    -   (III) hydroconverting said hydrocarbon feed having components        exhibiting a boiling point greater than 1000° F. to form product        having an increased proportion of components exhibiting a        boiling point less than about 1000° F. comprising contacting        said feed with hydrogen and a catalyst at isothermal or        substantially isothermal hydrotreating conditions and recovering        said product; and    -   (D) hydroconverting said feed, comprising contacting said feed        comprising a hydrocarbon oil with hydrogen and a catalyst under        conditions of elevated temperature above about 600° F. and        pressure above about 500 p.s.i.g. and recovering said product;        said catalyst comprising at least one metal from Group 6,        alternatively referred to as Group VIB, of the Periodic Table of        the Elements, at least one metal from Groups 8, 9 or 10,        alternatively referred to as Group VIII, of the Periodic Table        of the Elements, and optionally comprising phosphorous, wherein        said metals, and phosphorous when present, are carried on a        foraminous carrier or support, wherein: said support exhibits a        total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and        pore size distribution and contents corresponding to values as        measured by the mercury porosimetry method:    -   (1) equal to or greater than about 78% to about 95% of TPV in        pores having a diameter of less than 200 Angstroms (Å);    -   (2) greater than about 2% to less than about 19% of TPV in pores        having a diameter of 200 Angstroms (Å) to less than 1000 Å;    -   (3) equal to or greater than 3% to less than 12% of TPV in pores        having a diameter equal to or greater than 1000 Å; and    -   (4) a pore mode equal to or greater than about 90 Å and less        than about 160 Å.    -   14. A process as in paragraph 13 wherein said contacting is        carried out in at least one ebullated bed reactor or in at least        one fixed bed reactor.    -   15. A method for preparing a catalyst useful in at least one        process selected from the group consisting of:    -   (I) hydroprocessing a petroleum feed;    -   (II) hydrodesulfurization of hydrocarbons;    -   (III) hydrodenitrification of hydrocarbons;    -   (IV) hydrodemetallation of hydrocarbons; and    -   (V) hydrotreating a charge hydrocarbon feed containing        components boiling above 1000° F., and at least one component        selected from the group consisting of sulfur-containing        compounds, nitrogen-containing compounds, metal-containing        compounds, asphaltenes, carbon residue, sediment precursors, and        mixtures thereof,;    -   said method comprising impregnating a porous alumina carrier        with an aqueous solution comprising at least one catalytic agent        or catalytic agent precursor selected from the group consisting        of compounds of Group 6, alternatively referred to as Group VIB,        of the Periodic Table of the Elements, and compounds of Groups        8, 9 or 10, alternatively referred to as Group VIII, of the        Periodic Table of the Elements, and optionally comprising        phosphorous, said compounds being thermally decomposable to the        metal oxides and thereafter drying and calcining the resulting        impregnated carrier, said carrier having been prepared by:    -   (A) mixing pseudoboehmite alumina powder with water and        optionally nitric acid to form a damp mix;    -   (B) shaping the damp mix so as to form carrier particles        suitable for use in a hydroprocessing reactor; and    -   (C) drying and calcining the carrier particles to form calcined        pills;        said carrier comprising porous alumina having a total pore        volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and the        following pore size distribution and pore content corresponding        to values as measured by the mercury porosimetry method:    -   (i) equal to or greater than about 78% to about 95% of TPV in        pores having a diameter of less than 200 Angstroms (Å);    -   (ii) greater than about 2% to less than about 19% of TPV in        pores having a diameter of 200 Å to less than 1000 Å;    -   (iii) equal to or greater than 3% to less than 12% of said pore        volume in pores having a diameter equal to or greater than 1000        Å; and    -   (iv) a pore mode equal to or greater than about 90 Å and less        than about 160 Å.

16. The catalyst of paragraph 10, further exhibiting a macroporousstructure.

17. The catalyst of paragraph 13, further exhibiting a d50 greater thanabout 100 Å and less than about 150 Å.

18. The method of paragraph 15, said alumina carrier furthercharacterized in that equal to or greater than about 3% to less thanabout 10% of said TPV is in pores having a diameter equal to or greaterthan 1000 Å.

19. A foraminous catalyst carrier or support having a total pore volume(TPV) of about 0.6 cc/g to about 1.1 cc/g and comprising:

-   -   (a) equal to or greater than about 78% to about 95% of TPV in        pores having a diameter of less than 200 Angstroms (Å);    -   (b) greater than about 2% to less than about 19% of TPV in pores        having a diameter of 200 (Å) to less than 1000 Å;    -   (c) equal to or greater than 3% to less than 12% of TPV in pores        having a diameter equal to or greater than 1000 Å; and    -   (d) a pore mode equal to or greater than about 90 Å and less        than about 160 Å.

20. A support as in paragraph 19 further comprising a d50 greater thanabout 100 Å and less than about 150 Å.

21. A support as in paragraph 19 wherein said foraminous carriercomprises alumina.

22. A support as in paragraph 19 further characterized in that greaterthan about 5% to less than about 19% of TPV is in pores having adiameter of 200 Å to less than 1000 Å.

23. A support as in paragraph 19 further characterized in that equal toor greater than about 3% to less than about 10% of said TPV is in poreshaving a diameter equal to or greater than 1000 Å.

24. A support as in paragraph 23 further characterized in that equal toor greater than about 5% to less than about 10% of said TPV is in poreshaving a diameter equal to or greater than 1000 Å.

25. A support as in paragraph 19 wherein said foraminous carrierexhibits a substantially unimodal pore size distribution measured usingmercury porosimetry.

26. A support as in paragraph 25 wherein said pore size distributionincludes an additional peak at greater than about 200 Å provided thatthe total volume of pores comprised in such additional peak is greaterthan about zero to about 10% of the total pore volume present in saidporous alumina.

All documents described herein are incorporated by reference herein,including any patent applications and/or testing procedures. Theprinciples, preferred embodiments, and modes of operation of the presentinvention have been described in the foregoing specification.

Further, any range of numbers recited in the specification or claims,such as that representing a particular set of properties, units ofmeasure, conditions, physical states or percentages, is intended toliterally incorporate expressly herein by reference or otherwise, anynumber falling within such range, including any subset of numbers withinany range so recited. For example, whenever a numerical range with alower limit, R_(L), and an upper limit R_(U), is disclosed, any number Rfalling within the range is specifically disclosed. In particular, thefollowing numbers R within the range are specifically disclosed:

R=R L+k(R _(U) −R _(L)),

wherein k is a variable ranging from 1% to 100% with a 1% increment,e.g., k is 1%, 2%, 3%, 4%, 5% . . . 50%, 51%, 52% . . . 95%, 96%, 97%,98%, 99%, or 100%. Moreover, any numerical range represented by any twovalues of R, as calculated above is also specifically disclosed.

Although the invention herein has been described with reference toparticular embodiments, it is to be understood that these embodimentsare merely illustrative of the principles and applications of thepresent invention. It is therefore to be understood that numerousmodifications may be made to the illustrative embodiments and that otherarrangements may be devised without departing from the spirit and scopeof the present invention as defined by the appended claims.

1. A supported catalyst for treating hydrocarbon feedstocks to producetreated products, said supported catalyst comprising at least one metalfrom Group 6, alternatively referred to as Group VIB, of the PeriodicTable of the Elements, at least one metal from Groups 8, 9 or 10,alternatively referred to as Group VIII, of the Periodic Table of theElements, and optionally comprising phosphorous, wherein said metals,and phosphorous when present, are carried on a foraminous carrier orsupport, said carrier or support having a unimodal pore sizedistribution, a total pore volume (TPV) of about 0.6 cc/g to about 1.1cc/g and pore size distribution and contents corresponding to valuesmeasured by the mercury porosimetry method comprising: (a) equal to orgreater than about 78% to about 95% of TPV in pores having a diameter ofless than 200 Angstroms (Å); (b) greater than about 2% to less thanabout 19% of TPV in pores having a diameter of 200 (Å) to less than 1000Å; (c) equal to or greater than 3% to less than 10% of TPV in poreshaving a diameter equal to or greater than 1000 Å; and (d) a pore modeequal to or greater than about 90 Å and less than about 160 Å; andwherein the TPV and pore distribution characteristics recited in (a)-(d)of the support and supported catalyst are calculated on a metals freebasis.
 2. A supported catalyst as in claim 1 further characterized inthat said support exhibits a d50 greater than about 100 Å and less thanabout 150 Å.
 3. A supported catalyst as in claim 1 further characterizedin that greater than about 5% to less than about 19% of TPV is in poreshaving a diameter of 200 Å to less than 1000 Å.
 4. A supported catalystas in claim 1 further characterized in that equal to or greater thanabout 5% to less than about 10% of said TPV is in pores having adiameter equal to or greater than 1000 Å.
 5. A supported catalyst as inclaim 1 wherein said foraminous carrier or supported catalyst exhibitspore mode equal to or greater than 100 Å and less than 150 Å.
 6. Asupported catalyst as in claim 1 further characterized in that saidmetal of Group 6 is molybdenum and said metal of Groups 8, 9 and 10 isselected from the group consisting of cobalt, nickel and mixturesthereof.
 7. A supported catalyst as in claim 6 further comprisingphosphorous.
 8. A catalyst for use in at least one process selected fromthe group consisting of: (I) hydroprocessing a petroleum feed; (II)hydrodesulfurization of hydrocarbons; (III) hydrodenitrification ofhydrocarbons; (IV) hydrodemetallation of hydrocarbons; and (V)hydrotreating a charge hydrocarbon feed containing components boilingabove 1000° F., and at least one component components selected from thegroup consisting of sulfur-containing compounds, nitrogen-containingcompounds, metal-containing compounds, asphaltenes, carbon residue,sediment precursors, and mixtures thereof; said catalyst comprising atleast one metal from Group 6, alternatively referred to as Group VIB, ofthe Periodic Table of the Elements, at least one metal from Groups 8, 9or 10, alternatively referred to as Group VIII, of the Periodic Table ofthe Elements, and optionally comprising phosphorous, wherein saidmetals, and phosphorous when present, are carried on a foraminouscarrier or support, wherein: said support exhibits a unimodal pore sizedistribution, a total pore volume (TPV) of about 0.6 cc/g to about 1.1cc/g and pore size distribution and contents corresponding to values asmeasured by the mercury porosimetry method: (1) equal to or greater thanabout 78% to about 95% of TPV in pores having a diameter of less than200 Angstroms (Å); (2) greater than about 2% to less than about 19% ofTPV in pores having a diameter of 200 Angstroms (Å) to less than 1000 Å;and (3) equal to or greater than 3% to less than 10% of TPV in poreshaving a diameter equal to or greater than 1000 Å; and (4) a pore modeequal to or greater than about 90 Å and less than about 160 Å; andwherein the TPV and pore distribution characteristics recited in (1)-(4)of the support and supported catalyst are calculated on a metals freebasis.
 9. The catalyst of claim 8 wherein said catalyst has beenpre-impregnated, shaped, dried and calcined.
 10. The catalyst of claim8, further exhibiting a d50 greater than about 100 Å and less than about150 Å.
 11. A process for treating a hydrocarbon feedstock to producetreated products, said process selected from the group consisting of:(I) hydrodemetallation, hydrodenitrification, hydrodesulfurization, andhydrocracking, said process comprising contacting said feedstock in atleast one reactor with hydrogen under hydrocracking conditions with acatalyst and recovering said product; (II) hydrotreating saidhydrocarbon feed containing components boiling above 1000° F., and atleast one component selected from the group consisting ofsulfur-containing compounds, nitrogen-containing compounds,metal-containing compounds, asphaltenes, carbon residue, sedimentprecursors, and mixtures thereof, comprising contacting said feed withhydrogen and a catalyst at isothermal or substantially isothermalhydrotreating conditions and recovering said treated product; (III)hydroconverting said hydrocarbon feed having components exhibiting aboiling point greater than 1000° F. to form product having an increasedproportion of components exhibiting a boiling point less than about1000° F. comprising contacting said feed with hydrogen and a catalyst atisothermal or substantially isothermal hydrotreating conditions andrecovering said product; and (IV) hydroconverting said feed, comprisingcontacting said feed comprising a hydrocarbon oil with hydrogen and acatalyst under conditions of elevated temperature above about 600° F.and pressure above about 500 p.s.i.g. and recovering said product; saidcatalyst comprising at least one metal from Group 6, alternativelyreferred to as Group VIB, of the Periodic Table of the Elements, atleast one metal from Groups 8, 9 or 10, alternatively referred to asGroup VIII, of the Periodic Table of the Elements, and optionallycomprising phosphorous, wherein said metals, and phosphorous whenpresent, are carried on a foraminous carrier or support, wherein: saidsupport exhibits a unimodal pore size distribution, a total pore volume(TPV) of about 0.6 cc/g to about 1.1 cc/g and pore size distribution andcontents corresponding to values as measured by the mercury porosimetrymethod: (1) equal to or greater than about 78% to about 95% of TPV inpores having a diameter of less than 200 Angstroms (Å); (2) greater thanabout 2% to less than about 19% of TPV in pores having a diameter of 200Angstroms (Å) to less than 1000 Å; (3) equal to or greater than 3% toless than 10% of TPV in pores having a diameter equal to or greater than1000 Å; and (4) a pore mode equal to or greater than about 90 Å and lessthan about 160 Å; and wherein the TPV and pore distributioncharacteristics recited in (1)-(4) of the support and supported catalystare calculated on a metals free basis.
 12. A foraminous catalyst supportfor a catalyst for treating hydrocarbon feedstocks to produce treatedproducts, said support exhibiting a unimodal pore size distribution,having a total pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g andpore size distribution and contents corresponding to values as measuredby the mercury porosimetry method, comprising: (a) equal to or greaterthan about 78% to about 95% of TPV in pores having a diameter of lessthan 200 Angstroms (Å); (b) greater than about 2% to less than about 19%of TPV in pores having a diameter of 200 (Å) to less than 1000 Å; (c)equal to or greater than 3% to less than 10% of TPV in pores having adiameter equal to or greater than 1000 Å; and (d) a pore mode equal toor greater than about 90 Å and less than about 160 Å; and wherein theTPV and pore distribution characteristics recited in (a)-(d) of thesupport and supported catalyst are calculated on a metals free basis.13. A method for preparing a catalyst for use in at least one processselected from the group consisting of: (I) hydroprocessing a petroleumfeed; (II) hydrodesulfurization of hydrocarbons; (III)hydrodenitrification of hydrocarbons; (IV) hydrodemetallation ofhydrocarbons; and (V) hydrotreating a charge hydrocarbon feed containingcomponents boiling above 1000° F., and at least one component selectedfrom the group consisting of sulfur-containing compounds,nitrogen-containing compounds, metal-containing compounds, asphaltenes,carbon residue, sediment precursors, and mixtures thereof; said methodcomprising impregnating a porous alumina carrier with an aqueoussolution comprising at least one catalytic agent or catalytic agentprecursor selected from the group consisting of compounds of Group 6,alternatively referred to as Group VIB, of the Periodic Table of theElements, and compounds of Groups 8, 9 or 10, alternatively referred toas Group VIII, of the Periodic Table of the Elements, and optionallycomprising phosphorous, said compounds being thermally decomposable tothe metal oxides and thereafter drying and calcining the resultingimpregnated carrier, said carrier having been prepared by: (A) mixingpseudoboehmite alumina powder with water and optionally nitric acid toform a damp mix; (B) shaping the damp mix so as to form carrierparticles suitable for use in a hydroprocessing reactor; and (C) dryingand calcining the carrier particles to form calcined pills; said carriercomprising porous alumina having a unimodal pore size distribution, atotal pore volume (TPV) of about 0.6 cc/g to about 1.1 cc/g and thefollowing pore size distribution and pore content corresponding tovalues as measured by the mercury porosimetry method: (i) equal to orgreater than 78% to 95% of TPV in pores having a diameter of less than200 Å; (ii) greater than 2% to less than 19% of TPV in pores having adiameter of 200 Å to less than 1000 Å; (iii) equal to or greater than 3%to less than 10% of said pore volume in pores having a diameter equal toor greater than 1000 Å; and (iv) a pore mode equal to or greater than 90Å and less than 160 Å, wherein pore mode means the pore diametercorresponding to the peak maximum of the pore size distribution; andwherein the TPV and pore distribution characteristics recited in(i)-(iv) of the support and supported catalyst are calculated on ametals free basis.
 14. The method of claim 13 wherein the catalyst hasbeen pre-impregnated, shaped, dried and calcined.